A ski i bought the guy said it was a 760 and that all the info he gave me. I honed the cylinders to 84.5 no porting (stupid me) and a new ADA Head with 38cc domes. I found the motor was a 64x and I still have different compression in each cylinder. The front seems to be at the correct compression, but the back is pretty low. what is the best way to bring the compression up in the back? I am also assuming the electronics are all 64X however it has an aftermarket flywheel cover so not 100% sure.